Herramienta Gráfico de elevación
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La herramienta Gráfico de elevación genera un gráfico de respuesta capturada acumulativa y un gráfico de tasa de respuesta incremental que se utilizan para evaluar visualmente la precisión comparativa de diferentes modelos de clasificación binaria (sí/no) cuando se hacen predicciones a fin de realizar una evaluación de los efectos económicos esperados.
Both of these charts are based on aggregating data into 10 groups (deciles) that are ordered based on the predicted probability of a favorable response for each model, and then comparing this response to what would be expected if the selection of prospects was done randomly. In the case of the cumulative response chart, the chart examines what percentage of the total response that would be obtained if all customers in an organization's database were contacted is obtained by contacting the best 10 percent, 20 percent, and so on based on model predictions. The x (horizontal) axis of the chart is the percentage of the database contacted, while the y (vertical) axis is the percentage of the total response captured by going up to that "best" decile of the database based on the model.
For example, the best 20 percent of prospects based on the model may represent 50 percent of the favorable response that would be obtained if all prospects were contacted. The incremental response rate chart gives the favorable response rate for each of the model-based ordered decile groups in the database. In addition, the tool produces a gains table and measures of the area under the curve and the Gini coefficient to provide overall comparative metrics of the performance of different models when the cumulative captured response chart option is selected, and a table of response rates at different deciles for each model when the incremental response rate option is selected.
Esta herramienta utiliza la herramienta R. Dirígete a Opciones> Descargar herramientas predictivase inicia sesión en el portal de Descargas y licencias de Alteryxpara instalar R y los paquetes utilizados por la herramienta R. Visita Descargar y usar herramientas predictivas.
Conectar entradas
The tool requires...
Binary classification models, like the Neural Network tool, Logistic Regression tool, Decision Tree tool, Forest Model tool, Boosted Model tool, Spline Model tool, or Stepwise tool have been unioned together into a single data stream.
An Alteryx data stream or XDF metadata stream that is consistent with the model object (in terms of field names and the field types), and all have the same binary target variable.
Configurar la herramienta
Configuration Tab
Lift chart type: Select the Total cumulative response chart or the Incremental response rate chart.
True response rate (should be between 0 and 1): Often the database used to construct a predictive model has been "oversampled" to increase the percentage of observations that have one of the two target response categories. By specifying the true (original) response rate of the target variable, the lift chart constructed will account for the oversampling of one level of the target. Si no hay sobremuestreo, el valor de esta opción debe corresponder a la tasa de respuestas de la base de datos utilizada para desarrollar el modelo.
Target level (the label for the desired response of the target variable): This option allows for the creation of a lift chart that is consistent with the decision context, and allows for error checking to ensure that the chart created is relevant.
La opción Nombre de la muestra te permite colocar una etiqueta en el gráfico creado para indicar qué muestra dentro del flujo de datos se utilizó para crear el gráfico, o bien proporcionar otra información que pueda ser relevante para el gráfico.
Por último, establece la cantidad de registros que se debe leer a la vez para limitar la cantidad de registros que se extraen del flujo de datos de una sola vez.
Pestaña "Opciones de gráficos"
Plot size: Configure the plot size in either Inches or Centimeters.
Resolución del gráfico: selecciona la resolución del gráfico en puntos por pulgada: 1x (96 ppp); 2x (192 ppp); o 3x (288 ppp).
La resolución más baja crea un archivo más pequeño y es mejor para ver en un monitor.
Una resolución más alta crea un archivo más grande con una mejor calidad para imprimir.
Base font size (points): Configure the font size.
Ver la salida
The output for the tool is an Alteryx Report field that consists of an R-Graph and a Lift/Gains table. These elements can be used to assist in the creation of custom reports.